lpfc: Refactor Send LS Request support

Currently, the ability to send an NVME LS request is limited to the nvme
(host) side of the driver.  In preparation of both the nvme and nvmet sides
support Send LS Request, rework the existing send ls_req and ls_req
completion routines such that there is common code that can be used by
both sides.
Signed-off-by: Paul Ely <paul.ely@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/scsi/lpfc/lpfc_nvme.h

@@ -79,6 +79,12 @@ struct lpfc_nvme_fcpreq_priv {
 	struct lpfc_io_buf *nvme_buf;
 };
 
+/*
+ * set NVME LS request timeouts to 30s. It is larger than the 2*R_A_TOV
+ * set by the spec, which appears to have issues with some devices.
+ */
+#define LPFC_NVME_LS_TIMEOUT		30
+
 
 #define LPFC_NVMET_DEFAULT_SEGS		(64 + 1)	/* 256K IOs */
 #define LPFC_NVMET_RQE_MIN_POST		128
@@ -224,6 +230,13 @@ struct lpfc_async_xchg_ctx {
 
 
 /* routines found in lpfc_nvme.c */
+int __lpfc_nvme_ls_req(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
+		struct nvmefc_ls_req *pnvme_lsreq,
+		void (*gen_req_cmp)(struct lpfc_hba *phba,
+				struct lpfc_iocbq *cmdwqe,
+				struct lpfc_wcqe_complete *wcqe));
+void __lpfc_nvme_ls_req_cmp(struct lpfc_hba *phba,  struct lpfc_vport *vport,
+		struct lpfc_iocbq *cmdwqe, struct lpfc_wcqe_complete *wcqe);
 
 /* routines found in lpfc_nvmet.c */
 int lpfc_nvme_unsol_ls_issue_abort(struct lpfc_hba *phba,